Seat frame



FIG. 1 is a front perspective detailed view of a seat frame of a double seat of a bus without a cushion in accordance with the present design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a left side elevational view thereof;

FIG. 4 is a rear perspective view thereof;

FIG. 5 is a rear elevational view thereof; and,

FIG. 6 is a top plan view thereof. 

CLAIM The ornamental design for a seat frame, as shown and described. 